VIRTUAL LANs
Virtual LANs provide support for workgroups. A LAN consists of one or more LAN segments, and hosts on the same LAN segment can communicate directly through Layer 2 link layer without a router between them. These hosts share the same Layer 3 network layer subnet address, and communication between the hosts of one LAN segment remains in this segment. Thus Layer 3 network layer subnet address forms a broadcast scope that contains all hosts on the LAN segment. The workgroups are groups of hosts...
Signal stabilitybased adaptive routing
Signal Stability-Based Adaptive Routing SSA is a variant of the AODV protocol to take advantage of information available at the link level. Both the signal quality of links and link congestion are taken into consideration when finding routes. It is assumed that links with strong signals will change state less frequently. By favoring these strong signal links in route discovery, it is hoped that routes will survive longer and the number of route discovery operations will be reduced. Link signal...
Wireless Atm Architecture
A WATM network is intended to support integrated broadband services to MTs through an ATM User Network Interface UNI . Figure 12.1 shows a network diagram that illustrates various network entities and the functions that are required to support mobility in such an ATM network. In this architecture, the MT is an ATM end system that can support multimedia applications. The wireless link between the MT and BS provides the desired ATM transport services to the MT. A mobility-enhanced signaling...
Broadband Radio Access Integrated Network
Inoue et al. present the BRAIN for millimeter wave band multimedia communications. In BRAIN, all APs need to have only an OE converter because BRAIN incorporates radio-on-fiber technologies that allow for transmitting radio signals through optical fiber cables. Reservation Based Slotted Idle Signal Multiple Access RS-ISMA is a wireless access protocol designed for wireless multimedia communications and implemented in the BRAIN indoor-LAN prototype. In addition, a compact Radio Frequency RF...
Problems To Chapter 4
After completing this chapter you are able to demonstrate an understanding of different wireless protocols. explain a MAC protocol for wireless LAN. explain implementation of BRAIN architecture. explain the HAMAC protocol. demonstrate an understanding of demand assignment multiple access protocols. explain the role of a Request Table in ARCMA. explain implementation of multiple RA channels. 4.1 What is the role of network and native service access points 4.3 What are the functions of HAMAC...
Ccpp Exchange Protocol Based On The Http Extension Framework
The CC PP framework is a mechanism for describing the capabilities and preferences associated with users and user agents accessing the World Wide Web. Information about user agents includes the hardware platform, system software, applications, and user preferences P3P . The user agent capabilities and preferences can be thought of as metadata, or properties and descriptions of the user agent's hardware and software. The CC PP descriptions are intended to provide information necessary to adapt...
Grasshopper
The Grasshopper platform consists of a number of agencies hosts and a Region Registry a network-wide database of host and agent information remotely connected via an Object Request Broker ORB . Agencies represent the runtime environments for MAs. Several agencies can be grouped into one region represented by a region registry. Remote interactions between the components of the Distributed Agent Environment DAE are performed via an ORB. The Grasshopper's Communication Service is a part of each...
ATM networks
Handoff algorithms in terrestrial wireless networks focus on the connection rerouting problem. Basically, there are three connection rerouting approaches full connection establishment, partial connection reestablishment, and multicast connection reestablishment. Full connection establishment algorithms calculate a new optimum route for the call as for a new call request. The resulting route is always optimal however, the call rerouting delay and the signaling overheads are high. To alleviate...
Wap Push Architecture
The WAP Push framework introduces a means within the WAP effort to transmit information to a device without a previous user action. In the client server model, a client requests a service or information from a server, which transmits information to the client. In this pull technology, the client pulls information from the server. An example of pull technology is WWW, in which a user enters a URL the request , sent then to a server, which answers by sending a Web page the response to the user....
Wae Architecture
The WAE architecture includes networking schemes, content formats, programming languages, and shared services. Interfaces are not standardized and are specific to a particular implementation. WAE can work with a browser and a class of user agents used in the World Wide Web WWW . In the Internet WWW, applications present content to a client in a set of standard data formats that are browsed by client side user agents known as Web browsers. A user agent sends requests for one or more data objects...